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3 1-Identify the five components of a data communication system :sender, receiver, transmission medium, message, and protocol.

4 2- What are the three criteria for an effective and efficient Network?The three criteria are performance, reliability, and security

5 3-What are the 2 type of line configuration?Line configurations (or types of connections) are point-to-point and multipoint.

6 4-What is the difference between the half-duplex and full-duplex?In half-duplex transmission, only one entity can send at a time;in a full-duplex transmission, both entities can send at the same time.

7 5-for n devices in a network, what is the number of cable link required for mesh, ring, bus and star topology?The number of cables for each type of network is:a. Mesh: n (n – 1) / 2b. Star: nc. Ring: n – 1d. Bus: one backbone and n drop lines

8 6- What is an internet, what is the internet?An internet is an interconnection of networks.The Internet is the name of a specific worldwide network.

9 7-why are standard needed?Standards are needed to create and maintain an open and competitive market for manufacturers, to coordinate protocol rules, and thus guarantee compatibility of data communication technologies.

10 With 16 bits, we can represent up to 216 different colors.8- color image use 16 bit to represent a pixel, what is the maximum number of different color that could be represented?With 16 bits, we can represent up to 216 different colors.

11 10- in the ring topology in figure 110- in the ring topology in figure 1.8, what happens if one of the stations is unplugged?Theoretically, in a ring topology, unplugging one station, interrupts the ring. However, most ring networks use a mechanism that bypasses the station; the ring can continue its operation.

12 11- Draw hybrid topology with a star backbone and three ring network?

13 12- Performance is inversely related to delay, when you use the internet which of the following application more sensitive to delay ? -sending an . -copying a file. -surfing the internet.a. is not an interactive application. Even if it is delivered immediately, it may stay in the mail-box of the receiver for a while. It is not sensitive to delay.b. We normally do not expect a file to be copied immediately. It is not very sensitive to delay.c. Surfing the Internet is the an application very sensitive to delay. We except to get access to the site we are searching.

14 13- compare the telephone network and the internet network what are the similarity and what is the difference?Difference:Telephone network: is used for voice communication, circuit-switchednetwork.Internet network: is used for data communication, packet-switched network.Similarity: both are made of interconnections of small networks.

16 1-List the layers of the internet model?The Internet model, as discussed in this chapter, include physical, data link, network, transport, and application layers.

17 2-Which layer of the internet model is the user support layer?The application layer supports the user.

18 3-What is peer to peer process?Peer-to-peer processes are processes on two or more devices communicating at a same layer

19 4-What are headers and trailers how are they added and removed?Headers and trailers are control data added at the beginning and the end of each data unit at each layer of the sender and removed at the corresponding layers of the receiver.They provide source and destination addresses, synchronization points, information for error detection, etc.

20 5-What are the responsibility of the Data link layer in the internet model?The data link layer is responsible fora. framing data bitsb. providing the physical addresses of the sender/receiverc. data rate controld. detection and correction of damaged and lost frames

21 6-What are the responsibility of Transport layer in the internet model?The transport layer oversees the process-to-process delivery of the entire message.It is responsible fora. dividing the message into manageable segmentsb. reassembling it at the destinationc. flow and error control

23 8-How are OSI and ISO related to each other?The International Standards Organization, or the International Organization of Standards, (ISO) is a multinational body dedicated to worldwide agreement on international standards. An ISO standard that covers all aspects of network communications is the Open Systems Interconnection (OSI) model.